include/linux/pm_wakeup.h

   1 /*
   2  *  pm_wakeup.h - Power management wakeup interface
   3  *
   4  *  Copyright (C) 2008 Alan Stern
   5  *  Copyright (C) 2010 Rafael J. Wysocki, Novell Inc.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #ifndef _LINUX_PM_WAKEUP_H
  23 #define _LINUX_PM_WAKEUP_H
  24
  25 #ifndef _DEVICE_H_
  26 # error "please don't include this file directly"
  27 #endif
  28
  29 #include <linux/types.h>
  30
  31 /**
  32  * struct wakeup_source - Representation of wakeup sources
  33  *
  34  * @total_time: Total time this wakeup source has been active.
  35  * @max_time: Maximum time this wakeup source has been continuously active.
  36  * @last_time: Monotonic clock when the wakeup source's was touched last time.
  37  * @prevent_sleep_time: Total time this source has been preventing autosleep.
  38  * @event_count: Number of signaled wakeup events.
  39  * @active_count: Number of times the wakeup source was activated.
  40  * @relax_count: Number of times the wakeup source was deactivated.
  41  * @expire_count: Number of times the wakeup source's timeout has expired.
  42  * @wakeup_count: Number of times the wakeup source might abort suspend.
  43  * @active: Status of the wakeup source.
  44  * @has_timeout: The wakeup source has been activated with a timeout.
  45  */
  46 struct wakeup_source {
  47         const char              *name;
  48         struct list_head        entry;
  49         spinlock_t              lock;
  50         struct timer_list       timer;
  51         unsigned long           timer_expires;
  52         ktime_t total_time;
  53         ktime_t max_time;
  54         ktime_t last_time;
  55         ktime_t start_prevent_time;
  56         ktime_t prevent_sleep_time;
  57         unsigned long           event_count;
  58         unsigned long           active_count;
  59         unsigned long           relax_count;
  60         unsigned long           expire_count;
  61         unsigned long           wakeup_count;
  62         bool                    active:1;
  63         bool                    autosleep_enabled:1;
  64 };
  65
  66 #ifdef CONFIG_PM_SLEEP
  67
  68 /*
  69  * Changes to device_may_wakeup take effect on the next pm state change.
  70  */
  71
  72 static inline bool device_can_wakeup(struct device *dev)
  73 {
  74         return dev->power.can_wakeup;
  75 }
  76
  77 static inline bool device_may_wakeup(struct device *dev)
  78 {
  79         return dev->power.can_wakeup && !!dev->power.wakeup;
  80 }
  81
  82 /* drivers/base/power/wakeup.c */
  83 extern void wakeup_source_prepare(struct wakeup_source *ws, const char *name);
  84 extern struct wakeup_source *wakeup_source_create(const char *name);
  85 extern void wakeup_source_drop(struct wakeup_source *ws);
  86 extern void wakeup_source_destroy(struct wakeup_source *ws);
  87 extern void wakeup_source_add(struct wakeup_source *ws);
  88 extern void wakeup_source_remove(struct wakeup_source *ws);
  89 extern struct wakeup_source *wakeup_source_register(const char *name);
  90 extern void wakeup_source_unregister(struct wakeup_source *ws);
  91 extern int device_wakeup_enable(struct device *dev);
  92 extern int device_wakeup_disable(struct device *dev);
  93 extern void device_set_wakeup_capable(struct device *dev, bool capable);
  94 extern int device_init_wakeup(struct device *dev, bool val);
  95 extern int device_set_wakeup_enable(struct device *dev, bool enable);
  96 extern void __pm_stay_awake(struct wakeup_source *ws);
  97 extern void pm_stay_awake(struct device *dev);
  98 extern void __pm_relax(struct wakeup_source *ws);
  99 extern void pm_relax(struct device *dev);
 100 extern void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec);
 101 extern void pm_wakeup_event(struct device *dev, unsigned int msec);
 102
 103 #else /* !CONFIG_PM_SLEEP */
 104
 105 static inline void device_set_wakeup_capable(struct device *dev, bool capable)
 106 {
 107         dev->power.can_wakeup = capable;
 108 }
 109
 110 static inline bool device_can_wakeup(struct device *dev)
 111 {
 112         return dev->power.can_wakeup;
 113 }
 114
 115 static inline void wakeup_source_prepare(struct wakeup_source *ws,
 116                                          const char *name) {}
 117
 118 static inline struct wakeup_source *wakeup_source_create(const char *name)
 119 {
 120         return NULL;
 121 }
 122
 123 static inline void wakeup_source_drop(struct wakeup_source *ws) {}
 124
 125 static inline void wakeup_source_destroy(struct wakeup_source *ws) {}
 126
 127 static inline void wakeup_source_add(struct wakeup_source *ws) {}
 128
 129 static inline void wakeup_source_remove(struct wakeup_source *ws) {}
 130
 131 static inline struct wakeup_source *wakeup_source_register(const char *name)
 132 {
 133         return NULL;
 134 }
 135
 136 static inline void wakeup_source_unregister(struct wakeup_source *ws) {}
 137
 138 static inline int device_wakeup_enable(struct device *dev)
 139 {
 140         dev->power.should_wakeup = true;
 141         return 0;
 142 }
 143
 144 static inline int device_wakeup_disable(struct device *dev)
 145 {
 146         dev->power.should_wakeup = false;
 147         return 0;
 148 }
 149
 150 static inline int device_set_wakeup_enable(struct device *dev, bool enable)
 151 {
 152         dev->power.should_wakeup = enable;
 153         return 0;
 154 }
 155
 156 static inline int device_init_wakeup(struct device *dev, bool val)
 157 {
 158         device_set_wakeup_capable(dev, val);
 159         device_set_wakeup_enable(dev, val);
 160         return 0;
 161 }
 162
 163 static inline bool device_may_wakeup(struct device *dev)
 164 {
 165         return dev->power.can_wakeup && dev->power.should_wakeup;
 166 }
 167
 168 static inline void __pm_stay_awake(struct wakeup_source *ws) {}
 169
 170 static inline void pm_stay_awake(struct device *dev) {}
 171
 172 static inline void __pm_relax(struct wakeup_source *ws) {}
 173
 174 static inline void pm_relax(struct device *dev) {}
 175
 176 static inline void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec) {}
 177
 178 static inline void pm_wakeup_event(struct device *dev, unsigned int msec) {}
 179
 180 #endif /* !CONFIG_PM_SLEEP */
 181
 182 static inline void wakeup_source_init(struct wakeup_source *ws,
 183                                       const char *name)
 184 {
 185         wakeup_source_prepare(ws, name);
 186         wakeup_source_add(ws);
 187 }
 188
 189 static inline void wakeup_source_trash(struct wakeup_source *ws)
 190 {
 191         wakeup_source_remove(ws);
 192         wakeup_source_drop(ws);
 193 }
 194
 195 #endif /* _LINUX_PM_WAKEUP_H */